[R] test if files in current folder

[Prof Brian Ripley]

On Thu, 14 Jun 2007, Vladimir Eremeev wrote:

>
>
>
> runner wrote:
>>
>> I want to test if the files are already in my current folder before I
>> download or copy from somewhere else. What's in my mind is to check if a
>> file is open-able in current folder. Is there a way to do this, like in
>> Perl:
>> if (open()) { do sth}?
>>
>> To put it another way, how to extract all file names in a folder to an
>> array or list?
>>
>
> ?files
> ?dir
>
> BTW, Perl has nice -X functions, which allow file testing without explicit
> opening:
> http://perldoc.perl.org/functions/-X.html

which are based on those in 'test' and most Unix shells, as is R's 
file.test() in package 'utils'.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595